<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script src="jquery-3.3.1.min.js"></script>
</head>
<body style="margin: 0">
<div>
    <canvas width="200" height="200" style="border-style: dashed;"></canvas>
</div>
<div>
    图像数据预览：
    <canvas id="num-preview" width="20" height="20"></canvas>
</div>
<div id="result">
</div>
<div>
    <button id="btn-clear">清空</button>
    <button id="btn-recognize">识别</button>
</div>
<script src="app.js"></script>
</body>
</html>